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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment are comprised of the following at December 31:
Useful Life20212020
Land and improvements (1)
8 - 20 years (1)
$350 $404 
Buildings, structures and related equipment
5 - 40 years
2,271 2,618 
Machinery, equipment and other
2 - 20 years
7,259 7,451 
Total cost9,880 10,473 
Less: Accumulated depreciation (5,003)(5,115)
Property, plant and equipment, less accumulated depreciation
 $4,877 $5,358 
(1)Useful life excludes land.
Depreciation expense relating to property, plant and equipment was $852 million, $1,009 million and $1,053 million for the years ended December 31, 2021, 2020 and 2019, respectively. See "Note 18. Restructuring, Impairment and Other" for additional information on property, plant and equipment impairments.